I would recommend just some occasional fasting, whatever kind of fast is appealing or easy for you. Doesn't even have to be often.

For me, the biggest benefit is just breaking up the habits... especially the habit of panicking when peckish.

That said, this question set isn't wrong. It's about basics of what might be making you feel shit. Hungry, thirsty, pained, tired, etc.

Resilience in the face of these is great, but it ignorance of these is not.